DAF Truck Fault Codes

Caution: Two main modes are used for diagnostics: current self-test and testing.

Current self-diagnosis mode

To obtain the output diagnostic code, you must perform the following procedures.

1. Check the initial conditions.

A) The battery voltage is not less than 11 volts.

B) Throttle valve - completely closed.

C) Control lever for the gearbox - in neutral (I did in the parking lot - DAF).

D) All additional equipment is off.

E) The engine is warm to normal temperature.

2. Switch on the ignition, but do not start the engine.

3. Short the terminals of the diagnostic connector "TE1" and "E1".

4 Read the diagnostic code by the number of flashes of the "CHECK" display.

Forms of diagnostic codes

A) Normal operation of the system (no malfunction) - the light board lights up and goes off 2 times per second.

B) Fault code display.

If there is a malfunction, the light panel flashes every 0.5 seconds. The first sequence of flashes corresponds to the first number of the diagnostic code consisting of two digits. After a pause
of 1.5 seconds, the second flash sequence corresponding to the second number of code is output. If two or more fault codes are present, a 2.5 second interval is established between them. After
all the codes are output, there is a pause of 4.5 seconds, and then all of them are repeated until the terminals TE1 "and" E1 "of the diagnostic socket are closed.

Test mode

Attention: in comparison with the usual self-diagnostic mode, self-test in the test mode has an increased sensitivity to detecting faults.

This allows you to identify malfunctions in the electrical circuits of the start-up system, the air conditioning system, and also in the electrical circuit of the start inhibit switch.

Self-test in test mode allows you to identify faults that are recorded and normal self-diagnosis.

1. Check the initial conditions.

A) The battery voltage is not less than 11 volts.

B) Engine warmed to normal operating temperature

C) Control lever for the gearbox - in neutral (I did in the parking lot - DAF).

D) All additional equipment is off.

2. Short the leads of the diagnostic connector "TE2" and "E1", then turn on the ignition and the self-diagnosis system will function in test mode.

Attention: Confirming that the self-diagnosis system is functioning in the test mode is the flashing of the "CHECK" display when the ignition is switched on. In this case, the time between the
end and the beginning of successive pulses (flashes), i.e., the duty cycle of the pulses, is 0.13 seconds.

3. Start the engine and start driving at 10 km / h or higher.

4. Simulate situations in which a malfunction occurs.

5. Connect the leads "TE1" and "E1" of the diagnostic socket.

6. Read the diagnostic codes for the number of flashes of the "CHECK" light.

7 After diagnosis, disconnect the wires from the diagnostic socket.

Attention:

- The system will not enter test mode, if the outputs "TE2" and "E1" are closed after the ignition is switched on.

- At a vehicle speed of 5 km / h and lower, code # 42 (speed sensor) will be output, which is not a sign of a malfunction.

- If the engine does not turn by the starter, code 43 (starter) will be displayed, which is not a sign of a malfunction.

- If the automatic transmission control lever is in the "D", "2", "L" or "R" positions, or if the air conditioner is switched on, or if the accelerator pedal is fully depressed, code No. 51 ("air
conditioning" ), Which, however, is not a sign of a malfunction.